Illumination – Light source and modifier – Adjustable or repositionable modifier
Patent
1983-04-12
1986-03-11
Walsh, Donald P.
Illumination
Light source and modifier
Adjustable or repositionable modifier
362281, 362283, 362291, 362305, 362308, 362340, 362346, 34081517, F21V 700
Patent
active
045757860
ABSTRACT:
A modulated optical radiation beacon, e.g. a flashing light beacon or an IR emmissive missile jamming source, can comprise a radiation source and two relatively movable apertured masks which, as the apertures thereof move into and out of registration, pass or block the radiation from the source. Herein, to improve the uniformity of the polar distribution of the emitted radiation (assuming, of course, that a uniform distribution is required) or, in other cases, simply to improve efficiency, the apertures of the `inner` mask, i.e. the one nearest the source, are bounded by curved reflective surfaces defining an optical cavity which at least crudely images the source at a position near the outer mask. Advantageously, the optical cavities are defined by a spaced array of prismatic members having appropriately curved facing surfaces.
REFERENCES:
patent: 3221162 (1965-11-01), Heenan
patent: 4173777 (1979-11-01), Schmit
British Aerospace Public Limited Company
Walsh Donald P.
LandOfFree
Radiation emitting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiation emitting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiation emitting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2193983